<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div style="text-align: center; width: 200px;"> 
    <button id="send">发送消息到网页</button>
    <p id="response"></p>
  </div>
  <script src="popup.js"></script>
</body>
</html>